English Words Starting With O

• osteogenesis

  nounC1
  /ˌɒstɪəʊˈdʒɛnɪsɪs/The process of bone formation.
• osteogenesis imperfecta

  nounLow (Technical/Rare Disease)
  /ˌɒstiəʊˈdʒɛnɪsɪs ˌɪmpəˈfɛktə/A hereditary genetic disorder characterized by fragile bones that break easily.
• osteology

  nounC2
  /ˌɒstiˈɒlədʒi/the branch of anatomy concerned with the structure and function of bones
• osteoma

  nounVery Low / Specialised
  /ˌɒstɪˈəʊmə/A benign tumour composed of bone tissue.
• osteomalacia

  nounLow
  /ˌɒstɪəʊməˈleɪʃə/A medical condition characterized by softening of the bones due to vitamin D deficiency or impaired mineral absorption.
• osteometry

  nounC2
  /ˌɒstɪˈɒmɪtri/The measurement of bones.
• osteomyelitis

  nounLow
  /ˌɒstɪəʊˌmaɪəˈlaɪtɪs/A medical condition involving inflammation of the bone and bone marrow, typically caused by infection.
• osteopath

  nounC1
  /ˈɒstiəpæθ/A practitioner who treats medical conditions by manipulating and massaging the bones, joints, and muscles.
• osteopathy

  nounC1
  /ˌɒstiˈɒpəθi/A system of complementary medicine that focuses on the diagnosis and treatment of medical disorders through the manipulation and massage of the bones, joints, and muscles.
• osteopetrosis

  nounVery Low (Technical/Specialised)
  /ˌɒstɪəʊpɪˈtrəʊsɪs/A rare, inherited bone disorder where bones become overly dense and brittle.
• osteophyte

  nounLow
  /ˈɒstiəfaɪt/A bony outgrowth, typically on a joint margin or vertebra, often associated with osteoarthritis.
• osteoplasty

  nounC2
  /ˈɒstɪə(ʊ)ˌplasti/A surgical procedure to repair, reconstruct, or replace bone.
• osteoporosis

  nounMedium
  /ˌɒstɪəʊpəˈrəʊsɪs/A medical condition in which bones become brittle and fragile due to loss of tissue, typically as a result of hormonal changes, or deficiency of calcium or vitamin D.
• osteoradionecrosis

  nounVery low
  /ˌɒstiəʊˌreɪdiəʊnɛˈkrəʊsɪs/Bone death caused by radiation exposure, typically following radiotherapy for cancer.
• osteosarcoma

  nounC2 (Very Low Frequency - Specialized)
  /ˌɒstɪəʊsɑːˈkəʊmə/A malignant tumour derived from bone-forming cells, producing immature bone.
• osteosclerosis

  nounVery Low
  /ˌɒstɪəʊsklɪəˈrəʊsɪs/An abnormal hardening or increased density of bone tissue.
• osteosis

  nounVery Low
  /ˌɒstiˈəʊsɪs/A pathological condition characterized by abnormal formation or growth of bone tissue.
• osteotome

  nounVery Rare
  /ˈɒstiətəʊm/A surgical bone-cutting instrument with a chisel-like blade.
• osteotomy

  nounC2
  /ˌɒstiˈɒtəmi/A surgical operation in which a bone is cut, especially to shorten, lengthen, or change its alignment.
• osterreich

  nounB1
  /ˈɒs.tri.ə/A landlocked Central European country, officially the Republic of Austria.

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